Thread: CBTO new projectile

Cheers at @Tentman it was fun nice being at the range with time up my sleeve for once here is a previous 6 shots that if it wasn’t for my elevation adjustment would have slotted nicely into the rest so I’m certainly satisfied with the rifle set up

It's essentially impractical to manually measure mean radius. You need to work out where the mean point of impact of your shots is, then measure the radial distance of each shot from that point, then calculate the mean of those. It's simple with the Hornady App but you do have to pay 4 bucks or something to get Group Analysis in Hornady.

The variation between the 2x 10rd groups with your SAUM may or may not show a difference in precision from seating depth - really hard to be confident. 10rd groups with any load should be expected to vary in size by up to + or - 40% from the average, so about 0.9 and 1.3 moa is within that expected range.

Precision from any of them looks good for practical purposes as you say.

I reckon come left 1 click?

Might be getting a carbon ring with those marks on the bullet?

Originally Posted by Tentman

I like statistics and science. 3 shot groups are neither.

the only relevant group for hunting purposes is the one shot group.

Originally Posted by STC

the only relevant group for hunting purposes is the one shot group.

What evidence is there that "one shot" alone will do anything that isn't described by the cone of fire that can be estimated by taking a sample of 10+ shots?

Originally Posted by STC

the only relevant group for hunting purposes is the one shot group.

Also what if you're shooting 2 deer?

Originally Posted by gimp

Might be getting a carbon ring with those marks on the bullet?

Hard to say iv being very strict on cleaning this barrel for carbon because it took me hours to get one out of the last barrel I swore I’d never let it happen again so I hope not . The signs are the same though apart from pressure spikes be 80 odd on this barrel now with strict carbon cleaning will pull it out this morning and give it a good once over and chamber the dummy round and inspect it

Re tested 7mm08 this morning only 5 of each because it was more about whether the suppressor bush was playing havoc,

Results



And



I regret not doing 10 now but to me it’s a vast improvement to yesterdays first 5



Note theirs no adjustments made to scope the over all size is .915 and 1.015 nothing in it iv being caught out with suppressor bush’s before and should have known something was a miss with it all my bartliens have being boringly accurate

So no obvious difference in precision with the 7mm08 & OAL at SAAMI vs max mag length?

The ol' suppressor bush too tight on the barrel is never helpful

Originally Posted by gimp

So no obvious difference in precision with the 7mm08 & OAL at SAAMI vs max mag length?

The ol' suppressor bush too tight on the barrel is never helpful

Their to random new seating depths different from yesterdays and nope nothing to get excited about the shorter of the the 2 printed the bigger of the 2 groups (splitting hairs) but had the better sd (group that’s left of center) both of them are more than good enough for my max range of 400 yards on red deer sized vitals

@Kelton you can drop around and i can borescope it again for you. Also i can machine out that bush for a decent barrel clearance at the same time.

That kimber of mine had a major difference with the suppressor bushing being industry standard clearance vs being well clearance.

Just absolutely punished my 350yard gong 5 from 5 with a left of plate hold very small target at that range with the 10 power and thick vx3 hd reticle using the load with the better sd and ever so slightly bigger group plates 150x150mm happy Chappy being wanting to use this lrab despite the price

Also using my cds for the eldx so gave it an extra couple clicks to account for loss of velocity and bc uneducated guess and ended up bringing it back down to the eldx mark very usable set up

Originally Posted by STC

the only relevant group for hunting purposes is the one shot group.

How do you zero your rifle accurately with a one shot group?