bowhunter-tw Report post Posted October 14, 2022 Are loads really dependent on bullet brand? or could projectiles of the same weight be loaded with the same charge regardless of manufacture? Share this post Link to post Share on other sites
GreyGhost85 Report post Posted October 14, 2022 Yes they are. Different brands/projectiles of the same weights will shoot differently. Even identical components of a different lot number can/will shoot differently. Share this post Link to post Share on other sites
PRDATR Report post Posted October 14, 2022 Yes. An all copper bullet has a different ogive than a lead bonded bullet which will affect the pressure. Share this post Link to post Share on other sites
L Cazador Report post Posted October 14, 2022 You're asking a very broad question. It's best to use that bullet's manufacturer's reloading data. Todays manufacturers all have reloading data available on the internet. There's no substitute for load testing in your rifle. What works in your buddy's rifle isn't going to work the same in your's. And don't think that you can substitute bullets in your old load either cause you can't find the old bullets you used to load in it! 1 Share this post Link to post Share on other sites
ctafoya Report post Posted October 14, 2022 Even the same projectiles with different lot numbers will be different. 1 Share this post Link to post Share on other sites
bowhunter-tw Report post Posted October 14, 2022 24 minutes ago, L Cazador said: You're asking a very broad question. It's best to use that bullet's manufacturer's reloading data. Todays manufacturers all have reloading data available on the internet. There's no substitute for load testing in your rifle. What works in your buddy's rifle isn't going to work the same in your's. And don't think that you can substitute bullets in your old load either cause you can't find the old bullets you used to load in it! This is why I was asking, same charge, same weight bullet, different ogive and had pressure signs on one not the other (or atleast I think pressure signs) seeing ejector swipes Share this post Link to post Share on other sites
L Cazador Report post Posted October 14, 2022 Very good learning experience and very observant on your part!! There are only two ogives on the market. While Berger contends their hybrids are actually a blend of the two, secant and tangent, it's a tangent (I know Brian Litz is going to disagree with that! LOL) A secant ogive moves the nose of the bullet back from the lands while a tangent ogive moves it forward closer to the lands. A bullet seated closer to the lands can multiply the pressure exponentially! Over pressure puts needless wear and tear on the brass and your rifle's action! Start a new load. You may see the best load ever for that rifle! How do you tell secant from tangent? The secant has a sharp pointed nose where the tangent is more curved and gradual. 1 Share this post Link to post Share on other sites
bowhunter-tw Report post Posted October 14, 2022 Interesting though the secant had higher velocity for same charge Share this post Link to post Share on other sites
L Cazador Report post Posted October 15, 2022 22 hours ago, bowhunter-tw said: Interesting though the secant had higher velocity for same charge that's possible depending where you were at in relation to ogive to lands. Did you strip the bolt and measure lands to ogive? Share this post Link to post Share on other sites
bowhunter-tw Report post Posted October 16, 2022 On 10/14/2022 at 6:51 PM, L Cazador said: that's possible depending where you were at in relation to ogive to lands. Did you strip the bolt and measure lands to ogive? What do you mean by strip the bolt? Share this post Link to post Share on other sites
MMACFIVE Report post Posted October 20, 2022 Your question is very broad. in general if you have similar construction and similar profile the psi will be fairly close. L Cazador is spot on in it comments about psi increasing and the ogive approaches contact with the lands. There are also a whole bunch of factors than can change your psi: different powder lots, different brass weight, ambient conditions, etc. you need to be more specific in your test parameters. Share this post Link to post Share on other sites
bowhunter-tw Report post Posted October 20, 2022 I recently got a suppressor and all the load development was done pre suppressor. I am thinking the suppressor is adding back pressure and pushing my load over pressure. does this sound plausible? Share this post Link to post Share on other sites
PRDATR Report post Posted October 20, 2022 29 minutes ago, bowhunter-tw said: I recently got a suppressor and all the load development was done pre suppressor. I am thinking the suppressor is adding back pressure and pushing my load over pressure. does this sound plausible? Lance might be a good person to comment on this. Share this post Link to post Share on other sites
Crazymonkey Report post Posted October 20, 2022 You need to back off on your load for your suppressor.You can have issues with over pressure .You are essentially adding length to the barrel and adding back pressure from the can.I to will have to back down my load for my 7-08 as I developed it before I had the can and now I want to run suppressed. 1 Share this post Link to post Share on other sites
bowhunter-tw Report post Posted October 20, 2022 44 minutes ago, Crazymonkey said: You need to back off on your load for your suppressor.You can have issues with over pressure .You are essentially adding length to the barrel and adding back pressure from the can.I to will have to back down my load for my 7-08 as I developed it before I had the can and now I want to run suppressed. I was gonna drop down about 1/2 a grain, do you think this is sufficient or should I drop back a whole grain? Share this post Link to post Share on other sites
