Longshot

[Wyocaddis]

Anyone having any luck with this powder? and 180gr. bullets.

[The_Shadow]

Longshot has been a great powder for higher velocity loadings!  While Hodgdon has seemed to post lower charge weights than we have seen in the past, not sure if newer batches have more potential.  Personally I stop at 9.6 grains LS under the 180 grain Jacketed HP.

[fltbed]

Loading for velocity, YES
For accuracy, NO

My experience with it from a few years ago.  https://www.10mm-firearms.com/index.php?topic=4746.msg51667#msg51667

DISCLAIMER.  Hodgdon recently reduced the max load for Longshot and 180 gr bullets in the 10mm.  Today their max load is 8.2 gr (same as their 200 gr data) This was from the old data when the max load was 9.4 gr with an 180 gr XTP.

Jeff

[Wyocaddis]

seems to be a love, hate relationship..

[Wyocaddis]

Accuracy node seems to be about where?

[fltbed]

Accuracy node seems to be about where?

I never really found an accuracy node with 180 gr bullets.  It shoots ok with 200 & 220 gr.  Not as good as Blue Dot or BE-86 but acceptable.

Jeff

[sparkyv]

This has been my experience as well.

Loading for velocity, YES
For accuracy, NO

[Longcarbine]

It's all I use for my 10mm loads, 180gr XTP's, HST,s and Nosler's. I have nine 1911 10mm's and accuracy is excellent in all of them.

[The Professor]

What amount of Longshot with 180gr XTP bullet?

[blaster]

Long Shot is my favorite 10mm powder. I like em hot. I won't list my loads, but I got most of them from the pull-down section on this forum. they are all higher than any "book" loads I've seen. because of the hot climate where I am, I backed off a little on some of the hotter Swamp Fox data.

[The_Shadow]

Long Shot is my favorite 10mm powder. I like em hot. I won't list my loads, but I got most of them from the pull-down section on this forum. they are all higher than any "book" loads I've seen. because of the hot climate where I am, I backed off a little on some of the hotter Swamp Fox data.

Yes same here Blaster...SwampFox was up there a bunch.  I like a little extra safety margin incase brass might have an issue and yes it gets hot in Louisiana too!

[Gaintwist]

I just got a 4# Longshot. Shot in my CMMG yesterday 8gr/180Jacket was 1235'/s. Cases were very black? Had one jam in 20 shots. Should I try + or - loads? New to this so would appreciate some feedback.
thanks
Lige

[sqlbullet]

Black cases in a traditional locked breech pistol usually are a sign of low pressure and the brass failing to seal the breech fully. I am not familiar enough with the CMMG radial delay system to comment on what that should mean.  Your velocity and charge weight are in line with general expectations of velocity for an 8.0 grain charge.  I would assume that is just how they run without other information.  What do factory loads do?

As far as feedback, I am not sure your concern or your goals.

You don't state the accuracy of the tested load, so I am left to assume that either you didn't test accuracy or it was more than acceptable for your needs.

One general jam out of twenty shots is not statistically significant, but that is due to the limited testing.  If you reliability was in general 95% over 500 or 1000 rounds, I would say you might want to evaluate, but with only 20 shots fired, I would say keep shooting.  Usually COAL and process has more to due with reliability than charge weight, at least when you are well over the start load, which you are.  If reliability is your concern, keep shooting and provide more details about the kind of "jam":  Failure to feed, bolt over base, failure to extract, failure to eject, double feed, failure to go into battery.  The kind of jam matters a great deal in understanding the issue.

All in all I would say you have a solid start on what could be a decent reload. Unless accuracy is not acceptable, I would shoot another 250 rounds as least and keep track of the types of jams.  That will tell you and us what, if anything, needs to change.

[Gaintwist]

Thanks for the info. I am new to AR rifles and just starting. Will load more up to 9gr and see what develops. My existing powder choices were too fast so Longshot is what I will work with for now.

[wrf61]

Depending upon the buffer your MK10 has in it, you can use a different buffer with those loads. CMMG suggests for the Carbine Buffer that comes in the box with the gun, it should be used with ammunition that has a power factor of less than 190. The Buffer that is shipped in the gun, is an H3 Buffer, to be used with ammo with a power factor of more than 190. CMMG has a 3rd buffer you can order, that works with ammo with a power factor of more than 230. Power factor is found by multiplying your bullet weight x muzzle velocity and then dividing it by 1000. In your case, 180X1235=222.300 divided by 1000 = a power factor of 222.3. Also, CMMG states if your ejection pattern is consistently at 1 to 2 o'clock, a heavier buffer is recommended. If the bolt fails to consistently lock open after the last round, a lighter buffer is recommended.
CMMG has generous chamber dimensions and some report brass bulging with the standard and lighter buffer, but not with the heavier buffer with hotter loads, due to the heavier buffer keeping the Roller breech locking system closed longer. Variables exist that due to the load used, you need to experiment with what works for your gun and load.
As stated previously though by sqlbullet, one failure out of 20 is not definitive enough for a conclusion as to why.
Keep shooting.