shootmore
Silver $$ Contributor
Nothing seen for us. 2x .223.For the guys running these nuclear loads with the 90s, are any of you noticing any gas leakage around the primers or bolt face etching?
Nothing seen for us. 2x .223.For the guys running these nuclear loads with the 90s, are any of you noticing any gas leakage around the primers or bolt face etching?
Id go for the 80.5 freebore first. See how well it does. Then only increase the free-bore to move to the 90's if not satisfied. That's what i'm going to do on my next barrel.I am planning a new build and I am thinking I will use the 80.5 Berger with .125 freebore, instead of the 90's so I can get more life from the brass. I don't expect to shoot in competition any time soon so I thought this might be a good choice.
Or should I chamber for the 90's with .169 freebore and just shoot with lower velocity?
I'm just shooting for fun. (200- 500yd)
If you are shooting 600 yd F-TR and you are not using 90s (or the 95 Sierra) you are giving away a fair bit of windage to the 308s.
If you want to be competitive...
The recipe that works for almost everyone is:
PTG ISSF 223 reamer, .169 freebore <- <-
Varget, 24.5 grains (± 0.2)
Brass you like
Weigh charges to high precision (not sure it matters, but we all do it)
about .002 neck tension
1:7 twist
jam .10
28" minimum barrel, 30" preferable (mine is a 28)
The above recipe should have you in the range of 2800 to 2830 depending on barrel.
The above is cut and pasted from any one of the many threads that I've posted this over the last few yrs.
The freebore is critical, less and you will break something.
Many are finding that with a bit more freebore they can get the 90VLDs to shoot jumping.
H4895 works too, at a slightly lower loading for the same velocity, though I'm told the node that it runs is about 25FPS faster than Varget.
Makes a lot of sense. Where do we get oversize mandrel to open up the virgin necks? What size od?
I do. But I don’t think it’s terribly important. I’ve measured lots of brass and it’s not uncommon to find a case that’s a thousandth bigger on one side of the neck than the other, even with Lapua. Most of it is better than that- closer to the +/- 0.0005 that shootmore is seeing, and the inside diameter is usually pretty concentric with the outside.Does anyone turn the necks for this?
Lot to be said for thatWhen I quite turning necks, using a mandrel before seating a bullet, and several other tedious reloading steps, my scores went up significantly. My strings of 200 with higher x counts also went up. Think all that time in the reloading room had me cross eyed with carpel tunnel.
Sorry to hear that. Wonder if it is your bbl twist and not the freebore?I tested 90 VLD in my Fclass rifle, with no luck. From 0.010" ITL to 0.100" jump, powder for 2550 to 2750 fps, groups seens more like a shotgun pattern. 0,6 to 1 MOA at 100 yards.
What a waist of barrel life. I´m giving up.
Now going back to Berger 82 BT
Just started working up a load with a new barrel, 30 shots in, loaded for a club match f class where we shoot at 200 yds, tq-4 target, 1 inch x ring 3 strings of 20 to mimic 600 yds, with just a guess, 24.3 varget and touching the lands shot 600-57X, so 1/2 minute without any load work up. Promising to say the least. 2788 average fps with sd of 8.
30" krieger, 1-7 twist, ISSF reamer with .169 freebore.
Sorry to hear that. Wonder if it is your bbl twist and not the freebore?