22 Creedmoor- Lite Bullets

[Knifeman]

anyone running 60-70 gr bullets? And what kind of speed are you getting? Thanks

 

[msalm]

I'm interested in this too, I was considering shooting the 60gr Sierra TMK. I just built one in a med sporter, 26" barrel 1-8tw.

 

[LoanHarvey]

I am shooting the 75gr ELDM out of a 21.5" barrel at 3450.

 

[msalm]

I am shooting the 75gr ELDM out of a 21.5" barrel at 3450.

Wow, that’s fast...soooo a good 26” barrel and 60gr....hmmm. 3700+? And 500 rounds of accuracy

 

[JustinP]

Whatever you do, don’t go with a fast twist barrel for the lighter projectiles. The trade-off coming from 22CM and equivalents MV potential is the RPM rate. Anything north of 300,000 RPM and you’re ‘red-lining’ a fair few projectiles and then it’s grey-mist time...

That and the barrel life, of course...

 

[nmkid]

I am shooting the 75gr ELDM out of a 21.5" barrel at 3450.

Wow! I thought I was doing good shooting an 80 gr Nosler at 3500 with a 28" barrel out of my 22 Creedmoor.

 

[venatic]

I am shooting the 75gr ELDM out of a 21.5" barrel at 3450.

What powder?

 

[LoanHarvey]

What powder?

RL16

 

[venatic]

Wow I couldn’t get that speed with a 24 inch barrel with Reloder 16 without sticky bolt.

 

[Knifeman]

Went with a Brux barrel 1-8 tw. 24” length. Been waiting for the Gunsmith to get it finished . Picked up some Alco 69gr bullets Will post results when I get it back.

 

[xswanted]

I am shooting the 75gr ELDM out of a 21.5" barrel at 3450.

it’d be interesting to know the pressure on this load.

 

[msalm]

I was working up loads with the 60gr TMK on a 26” bbl and saw pressure at high 37’s. I think I backed down to 3730fps but I’ll have to look at the load data, don’t even remember the powder I used! I do remember having to open up the flash hole on Peterson SRP brass to get rid of a slight hangfire.

 

[Zero333]

it’d be interesting to know the pressure on this load.

Depending on brass capacity... I ran the #'s in Quickload with 50 gr total case H2O capacity, 22" barrel and with RL-16,,, 75 eldm, 2.650" COAL... it ended up at 66,777 psi. Which might sound like a lot, but some cartridges are rated to 65,000 psi.
6 and 6.5 CM are rated MAX psi around 61,000, probably cause of gas guns. I think it's still safe in a bolt gun, but definitely not in a gas gun, and no matter what, the brass will have short life span.

If I run the #'s in Quickload and RL-26,.. 22" bbl, 50 gr H20 capacity, the 22 creed will push the 75 eldm at 3,450 fps at 62,400 psi.
At least that's what the program estimates.

 

[Knifeman]

What primer are you running???

 

[xswanted]

Depending on brass capacity... I ran the #'s in Quickload with 50 gr total case H2O capacity, 22" barrel and with RL-16,,, 75 eldm, 2.650" COAL... it ended up at 66,777 psi. Which might sound like a lot, but some cartridges are rated to 65,000 psi.
6 and 6.5 CM are rated MAX psi around 61,000, probably cause of gas guns. I think it's still safe in a bolt gun, but definitely not in a gas gun, and no matter what, the brass will have short life span.

If I run the #'s in Quickload and RL-26,.. 22" bbl, 50 gr H20 capacity, the 22 creed will push the 75 eldm at 3,450 fps at 62,400 psi.
At least that's what the program estimates.

Could be right around there.

When peterson did their testing they listed a load with a 75 ELDM at 3457 just under 62000psi in a 24” Barrel

so if a guy figures around the 25-35 fps per inch of barrel a 21.5” barrel add the extra 75-90 fps you’re working with 3535-3550 fps

peterson then tested another load with the 75eldm going just under 3500fps and ended up with over 66k psi.

So you’re data is probably pretty accurate but still conservative in my opinion.

The fact of the matter is, a lot of guys are talking how much faster a 22 Creedmoor is than a 22-250ai, and when each case is loaded to the same pressures, there isn’t much difference. And thus they end up over loading the creed and the ACKLEY simply because they don’t realize they’re doing it.

Neither case shows pressure signs all that well so my personal opinion is to stay inside recommended data.

My guess is this load is closer to 70k

Hard to argue with either though. I have the Ackley and I know the load I use is quite high pressure but it holds together, and components are not beat up. I wish a guy could pressure test his own loads, be interesting to know.

 

[284winner]

My buddies 22CM is so close in fps to my 22-250AI, it wouldn't be worth changing barrels to get into a 22CM. I mean the numbers were 21-31fps differences literally when we did load work on the best performance for each gun. We could get very high speeds but accuracy wasn't there. In fact, some of my best accuracy loads wound up faster than his best accuracy loads. It's really a toss up. My next barrel may be a 22CM simply for the brass and not fireforming