scoutm Report post Posted February 6, 2008 When adding turrets to existing scopes or when mounting a scope with target turrets has anyone used a shim or +MOA bases in order to maximize the elevation travel - ie. puting +15 or +25 moa base or shim to force the the initial sight in to use up the downward travel so you can then re-use it or pick it back up for additional upward travel? Is it necessary or do most scopes have enough travel to get you out to the 800yd mark making +MOA bases or shims unnecessary? Share this post Link to post Share on other sites
Coues 'n' Sheep Report post Posted February 6, 2008 When adding turrets to existing scopes or when mounting a scope with target turrets has anyone used a shim or +MOA bases in order to maximize the elevation travel - ie. puting +15 or +25 moa base or shim to force the the initial sight in to use up the downward travel so you can then re-use it or pick it back up for additional upward travel? Is it necessary or do most scopes have enough travel to get you out to the 800yd mark making +MOA bases or shims unnecessary? Most 30 mm tubes have enough travel for a flat shooting gun to reach 900-1000 yds real easy. The Huskumaw Scope I put on my 300 Wby Mag goes to over 900 yds on one turret revolution with a 168 gr. Berger VLD. Your best bet is to shoot a 7mm Mag., a 300 RUM, a 300 Wby mag, or something better balistics than those if you plan to shoot out that far anyhow. CnS Share this post Link to post Share on other sites
elpepe25 Report post Posted February 6, 2008 ive heard that if thats what your trying to do...sloped bases are the way to go Share this post Link to post Share on other sites
scoutm Report post Posted February 6, 2008 When adding turrets to existing scopes or when mounting a scope with target turrets has anyone used a shim or +MOA bases in order to maximize the elevation travel - ie. puting +15 or +25 moa base or shim to force the the initial sight in to use up the downward travel so you can then re-use it or pick it back up for additional upward travel? Is it necessary or do most scopes have enough travel to get you out to the 800yd mark making +MOA bases or shims unnecessary? Most 30 mm tubes have enough travel for a flat shooting gun to reach 900-1000 yds real easy. The Huskumaw Scope I put on my 300 Wby Mag goes to over 900 yds on one turret revolution with a 168 gr. Berger VLD. Your best bet is to shoot a 7mm Mag., a 300 RUM, a 300 Wby mag, or something better balistics than those if you plan to shoot out that far anyhow. CnS The gun I'm considering putting the scope on is chambered in 270 WSM. The trajectory is similar if not a little better than the rounds you mentioned - depending on your choice of load. I already have the scope on a different gun but was considering making a swap to take better advantage of the the target turrets it has. The scope has a 1" tube and I just don't know about whether it will have the travel if I don't shim it or use +moa bases. I determined that from the factory setting I have about one and a half rotation before the travel ends. I have no intention of shooting game at those kinds of ranges but if I'm going to get the gun up for long range shooting I would like to do it right and have the travel necessary to get out to 800+ if for nothing else the ocassional long range target practice. Thanks for the help. Share this post Link to post Share on other sites
TAM Report post Posted February 7, 2008 Larry, One thing you can do to ensure that your scope will work without the shims is to zero it at 300 yard versus 100 yards. That way it will require fewer clicks to get from 300 yards to 800 yards. It will also make it easier to shoot at animals 300 yards and under because you won't need to make any adjustments at all. This is how I have my Ziess Conquest 6.5-20 scope set up on my .270 Weatherby mag and I have no problems getting out to 800 yards. Much beyond that and I would need the shims. Good luck! Share this post Link to post Share on other sites
Coues 'n' Sheep Report post Posted February 7, 2008 When adding turrets to existing scopes or when mounting a scope with target turrets has anyone used a shim or +MOA bases in order to maximize the elevation travel - ie. puting +15 or +25 moa base or shim to force the the initial sight in to use up the downward travel so you can then re-use it or pick it back up for additional upward travel? Is it necessary or do most scopes have enough travel to get you out to the 800yd mark making +MOA bases or shims unnecessary? Most 30 mm tubes have enough travel for a flat shooting gun to reach 900-1000 yds real easy. The Huskumaw Scope I put on my 300 Wby Mag goes to over 900 yds on one turret revolution with a 168 gr. Berger VLD. Your best bet is to shoot a 7mm Mag., a 300 RUM, a 300 Wby mag, or something better balistics than those if you plan to shoot out that far anyhow. CnS The gun I'm considering putting the scope on is chambered in 270 WSM. The trajectory is similar if not a little better than the rounds you mentioned - depending on your choice of load. I already have the scope on a different gun but was considering making a swap to take better advantage of the the target turrets it has. The scope has a 1" tube and I just don't know about whether it will have the travel if I don't shim it or use +moa bases. I determined that from the factory setting I have about one and a half rotation before the travel ends. I have no intention of shooting game at those kinds of ranges but if I'm going to get the gun up for long range shooting I would like to do it right and have the travel necessary to get out to 800+ if for nothing else the ocassional long range target practice. Thanks for the help. I know that I am gunna get bashed for this.... but what about wind drift on the 270 WSM..... there are a lot of variables at those long distances...... As far as the bases that you are talking about..... I think those are more for guys that plan to shoot beyond 1000 yds. But I am not sure..... I would assume that sub 1000 yd shots will be no problem with standard bases. I have shot my rifle at 1000 yds and had a bunch of room left. But that is a question that might be much easily answered over at: www.longrangehunting/forums/ ......some of those guys are kinda brutal, but there are a lot of them that are a wealth of info. Good luck. CnS Share this post Link to post Share on other sites
firstcoueswas80 Report post Posted February 7, 2008 Gino, there not a whole lot of difference in wind drift with the 270 wsm than any 300. The 140 Accubond has a Bc of .496... not bad. Share this post Link to post Share on other sites
scoutm Report post Posted February 7, 2008 Wind drift is definitely a consideration/concern but if I'm understanding my scopes specs there should be ample windage adjustment to account for 10+ mile/hr wind so I'm not concerned that I will run out of travel in the windage adjustment. I pulled some information about wind drift for what I would think would be common loads off of Federals web-site and they are all very compariable and all within my scopes range. Thanks for the other forum information - I'll check it out and and see what I can learn from them as well. Wind Drift in Inches 10 MPH Crosswind @ 100 200 300 400 500 270WSM 140 Nosler AB 0.6 2.2 5.2 9.5 15.4 300RUM180 Bear Claw 0.7 3.1 7.2 13.5 22.2 300WBYA 180 Nosler Partition 0.6 2.5 5.8 10.5 17.2 7mm RM 160 Nosler partition 0.6 2.7 6.0 11.3 18.2 Thanks again for the feedback. Share this post Link to post Share on other sites
Coues 'n' Sheep Report post Posted February 7, 2008 Looks Good, Scout'm! Best of luck! Share this post Link to post Share on other sites
