A lot of attained shooters place a giant emphasis on using a temperature secure powder, but could we as shooters have forgotten the value of a temperature secure primer
I do get Anything you’re expressing, and truly don’t want to be argumentative … but I assume we just disagree on the proper equilibrium involving simplicity and complexity. The good thing is, I’m the author below as well as the one which places so much time into all these things, so we’ll select my eyesight for the material.
I have an interestng BDC turret wrap design from my scandinavian buddies and it spans from -twenty to +twenty for Lapua navy sniper ammo any variation is staggering after you get past 500m or so.m
Vaughn. I bet you might learn quite a bit from the man like that. Which is a fascinating idea concerning the put up-muzzle acceleration, however it seems like Those people guys might have corrected for that while in the application. Following time I see them, I’ll certainly talk to! You’ve bought me pondering!
I will Take note the H4350 loads in my examination experienced a mean SD of 6 fps! The Varget load also experienced a single digit SD.
We previously know Individuals aren’t, so there was no feeling squandering time and barrel everyday living on them. I just needed to put the outcomes in context; all 4 of these powders outperform most Other people around.
Exciting reviews about barrel size and fee of twist Despite the fact that could possibly be dated For the reason that document appears to acquire originated about 2004.
Nicely, Mike. It’s in all probability not as significant of the deal as you think that. Look at the velocity variances during the chart I posted in the comments. That guy chopped a barrel down one inch at any given time, and recorded muzzle velocities. Discover that a 22″ barrel was just fourteen fps slower than a 27″ barrel.
That’s an excellent concern, Kasper! During the barrel examination I done not too long ago, I measured chamber temperatures around a 20 round immediate-fire string (all fired inside of 1 minute) and a 50 round slow-fireplace string (fired over 20 minutes). The temperatures I recorded weren’t as large as you may think they would have been. Even over the quick-fire take a look at, the best chamber temperature I found was 149° F. Now semi-automatics would probable get A lot greater, but this was all completed for bolt-motion rifles and 20 rounds for each moment is a fairly speedy charge of hearth.
As opposed to point out “ten shot groups can exactly describe the actual distribution of pictures” point out From ten shot teams in addition to a identified or assumed Generally chance distribution one can determine a great estimate from the imply from the group.
1 fps or 0.01 fps? Wouldn't it change the group precision at 100 yards in the least? Would it not change the SD on the muzzle velocity in the least? Visit the assortment which has a specified rifle, ammunition, sighting process and platform and decide the group precision at a hundred yards, suggest muzzle velocity and muzzle velocity SD for read more any supplied ambient temperature. Then all personal consequences for example effect of temperature on powder and any impact because of thermal expansion or alter in Actual physical Houses are “involved” as part of your measurements. This can be the vintage engineering approach but diploma pf applicability of final results to other rifle-ammo-sight-System units might be little known at most effective.
Now Permit’s operate that very same precise state of affairs to the muzzle velocities we acquired for by far the most temperature stable powder, H4350.
Many thanks for your screening, I take advantage of H-one thousand a whole lot, I'm wondering whether it is just as secure because it’s also a Hodgedon Extraordinary powder. Terrific posting
I did see my BC strengthen slightly by pointing. So for those who’re trying to find every single final benefit you may get, pointing might be really worth your time and efforts! But I didn’t do this in these exams. I seated the Berger 140gr Hybrid bullets utilizing a Whidden Gunworks Bullet Seating Die, that have tested to provide quite dependable and repeatable seating depth.