308 for F/TR

Paul at Connaught in Ottawa most shooters are using 30" barrels with 155gr bullets, I have never seen anyone shooting Hornady,s they shoot Lapua, Sierra & Bergers
45 to 47gr Varget. some are using Rl 15 & VT powders one fellow shoots well with H4895
 
paul

there is nothing wrong with 45g of varget as long as your fps. is around 2950,my load for the 155s was 46 of varget and out of a 30 inch barrel was 3030fps.

what is important is your extrem spread for longrange you want to get it as low as possible in the single digits would be real nice. Darin
 
Hi Paul

Without knowing what your velocity is we can't tell you whether or not you need to bump up your load. As Bulldog as stated you need to be around 2950 with the 155's to make sure you stay above the speed of sound at 1000 yards which is 1120FPS if you can do that with your current load then your good to go.

The 168's are not typically used beyond 600 as they are un-reliable, you would need to run them close to 2900 to make them work right and this is pushing them.

175's... without quickloads in front I can't confirm but suspect Brad was able to get the velocities he needed to make them work at distance.

P.S. if your thinking of shooting that "other" caliber in FTR the 223 there is no better source then Manitou210 he can shoot with the best of them.

Trevor
 
Thank You all for Your "mental donations" I really appreciated any info my brain cells can get, I didn't realize how complicated long range shooting (and expensive can be) right now I have a cocktail of information just have to sort through and come up with the plan, it seams I'm wasting my time with Sierra 168 hoping to be bullet of choice, lack of availability of other bullets (155) and 175 make the whole thing worse,
Now do I start clean from the beginning and concentrate on 155 for my 12 twist and 175 for 10 twist barrels, or should I keep trying the loads I have been working with (150 for 12) and 168 fro 10 twist, I just dont want to waste my time and end up with using what others are already using and waste my barrel life for the other loads - thank You again for all the info keep it going please

Paul W
 
paul w

your 1 in 12 wil work just fine from 155 to 185 and everything inbetween.your 1 in 10 will come in to play with the 190 to 200 plus bullets.

i will be doing some testing this fall winter with a 1 in 10 in a 308win.with rl17 and a few other powders with the 208 amax and the bergers210 i will be posting as the results come out.

Darin
 
obtunded

you are right i did try it in 2 of my match rifles they will stabelize but the accuracy was not their for me,in my fclass rifle the groups were not tight enought to be competitive in my guns.will be trying the 1 in 10 to see the difference.. Darin
 
I've had 210's work great in a 1-12" on warm days, and then fall apart on cold days. I'm at sea level to boot, so I'm inclined to believe Mr. Litz when he recommends 1-11" for the 208-210 stuff. I'll report back when the new barrel is operational. The 185's sure do work great in a 1-12" though!
 
hi matt

i must agree with you on the 1 in 12 and the 185 they seem to work good for us this summer eh.do you think the 1 in 10 will be the way to go for the 208,210??

Darin
 
I'm sure the 1-10 will work, but I don't think it's necessary, hence my 1-11" experiment. I'm happy to follow Bryan Litz's advice, and the yellow box says 1-11".
 
I note in a couple of the threads above that 1:11 twist is mentioned as possibly the best way to go for say, 185 gr bullets. I agree. It may be of interest to some of you that Ted Gaillard will do up a .308 barrel for you with 1:11 twist.

That twist is not listed on his website, but he will do it - I have one.

As an added note: I have not noticed any real increase in recoil between 168 gr / 170 gr and 185 gr using loads recommended in the Sierra loading manual.
 
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Following up on my comments about heavy bullets and accuracy, I will try to explain.
Absolute accuracy and practical accuracy
There are few actions at work when shooting heavy vs. light bullets for ANY caliber. Recoil, barrel time, pressure.
If we assume the pressure is the same shooting both light and heavy bullets then we will also have to agree that in order to achieve the same pressure the bullets will produce different velocities, barrel time and recoil.
Recoil is pretty straight forward the heavier the bullet the greater the amount of recoil. Velocity and barrel time are a little more complicated if i am capable of shooting the 155 @ 3000 then using the same pressure I should be able to shoot the 185 2800. That difference of 200fps between the bullet weights equates into longer barrel time for the heavies bullets. A longer barrel time also means that the shooter has to maintain his follow through longer then if he were shooting a lighter bullet. This is were recoil comes into play if we need to hold our shot longer because of the slower speed we also have to fight the increased recoil generated by shooting a heavier bullet.

So a longer barrel time + increased recoil will reduce the amount of Absolute accuracy we can achieve. In practical terms for F Class if I can shoot .2moa at 300 yrds with the 155's but can only manage to shoot .25moa with 185 or 210 it is a wash as I am still well below the .5 moa needed to be competitive.

Hope this helps.

Trevor
 
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