I just got a Mech Tech Systems 16" carbine upper for my Glock pistol. I have a bunch in 45acp but this is the first 10mm. Trying to use slower powder to keep pressure down and use the long barrel for velocity. Tried HS6 and 296 and no good, tried a ladder of Power Pistol and 2400 and the SD's were 3 and 4 but velocities were from 1115 to hottest load was 1180fps. And both those grouped well but I expected more speed from that carbine barrel. With 30 degree temp swings in one day in Texas I am trying to stay away from temp sensitive powders. Any suggestions would be appreciated from anybody that has loaded for a longer barrel.
10mm rifle, Welcome to the forum!
Power Pistol should work if you get the load right. Blue Dot and LongShot are also a good choices.
What was your Power Pistol load? Bullet weight?
Max load from all the reloading data I could find, I worked up to it, but I Boran Nitride coated the 200gr XTP's in bulk before loading. The Boran Nitride drops the friction and pressure dramatically so I don't want to post the charge and someone read it and shoot a naked bullet because in a rifle it would be way too hot without the coating. When we fired the Boran coated bullets, the primers looked normal and no pressure signs on the brass and I shot one group right after another and never stopped because I wanted to get done before the range closed and the barrel never even got warm.
Think it's an accurate statement that any bullet / powder combination that produces good velocities out of a pistol length barrel will yield greater velocities in a carbine.
For heavy bullets I'd use Longshot & #9, mid to light Power Pistol.
In my experience with PCC's, powers that produce the highest velocities in a pistol length barrel also show the highest velocities in a carbine length.
Since you want to stay away from temp sensitive powders, I would recommend looking at Longshot. Other choices that are slightly temp sensitive are 800X (hand weighed of course) and VV 3N38. (reverse temp sensitive)
If you don't mind putting up with the temp sensitivity, Max charges of Accurate #9 should give good results although, I wouldn't bother coating the bullets as I can't get enough #9 in the case to overload and coated bullets would just reduce the velocities. (I've gotten best results when lit with either CCI 350 or Federal 155 Magnum primers.)
Jeff
I see Benchrst already beat me to it.
Quote from: 10mm rifle on May 20 2016 05:54:23 AM MDT
Max load from all the reloading data I could find, I worked up to it, but I Boran Nitride coated the 200gr XTP's in bulk before loading. The Boran Nitride drops the friction and pressure dramatically so I don't want to post the charge and someone read it and shoot a naked bullet because in a rifle it would be way too hot without the coating. When we fired the Boran coated bullets, the primers looked normal and no pressure signs on the brass and I shot one group right after another and never stopped because I wanted to get done before the range closed and the barrel never even got warm.
Here is what I will suggest...The 10mm being a straight walled casing with a slight taper crimp and you are loading bullets with lower frictional coefficients. Seeing this bullet is also a frictional fit, the bullet could be moving or jumping out of the case before the full ignition of the powder charge occurs.
This could explain the dismal velocities and lack of pressure for a given load. Have you noticed any unburned powders in the testing? On the shooting bench, blowing back on you while shooting?
You could try applying slightly more crimp to allow fuller ignition of what you are working with.
Any load you are shooting should at least match what it would be using a non coated bullet. If not then I would again suspect the bullet is being pushed before it can get up to speed and powder is un burned.
Shadow thanks, I have not had any unburned powder and with a coated bullet I have worked up slowly until I started to flatten primers and quit. And there is PLENTY of room even with a 200gr bullet to load enough 2400 to get excessive pressure. I found a old thread from 2008 where two pages of chrono data was posted, very detailed and most loads were 165 to 180 gr and that guy came to the conclusion that the lighter bullets benefitted more from the slower powders and longer barrel. The rifle is amazing, and Power Pistol and 2400 so far have been best. I will try LilGun because I have a bunch for my 458 SOCOM and I bought Blue Dot and CFE Pistol today. Spent the afternoon looking and calling for AA#9 and there is none in Central Texas. 2400 shot a 5/8" CTC group at 50 yards with 200 gr XTP, Federal LP and was very soft to shoot, my daughter would have loved it.
Good luck, if you want to discuss some of the specific data you can private message me. I'd be happy to work with you, to see if I can help out or even learn more.
Shadow thanks, when I have more data I will. It is an amazing carbine, 2400 gave me SD;s of 3 and 4 and shot very well just not the WARP speed velocities that I have been seeing posted on forums. I would rather be accurate than fast because we shoot longer ranges, 7-25 yards is boring unless you are shooting at golf balls. And the 45acp units I have we shoot them at a 100-yards with a Red Dot, at clay pigeons on the berm and rarely miss so I know the 10mm will be impressive, that's why I put a 1-6X scope on this one.(//)
Well I cannot get pic to post even the small file of 88KB using browse attachments uploading that and insert image. And alt+P and alt+s, Oh well
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10mm Rifle
Do you have an update on your success reloading for the Mech Tech? Took mine to the range for the 1st time yesterday and using 9.1gr of LongShot, 180gr Berry's double struck bullets, OAL 1.250 was getting a light smile. This load is below max in my G20. I have some 2400 to try with both Hornady 200's and some 200gr plated.
Mechtechs use a recoil blowback system, so with slower powders you can get case head separations! Be careful people.
I run Longshot and Bluedot for my MT 16" with 180 gr. AA #9 is just too slow, you'll have pressure in the barrel as the brass is being ejected, leading to stressed brass...
8 gr of Longshot with CCI 350 and 220 gr Xtreme rocks in this gun. Good thumper round that makes 1250 fps easily (mimics my 40 Super loads actually). Very pleasant round and you could dial it back to subsonic if you ever choose to suppress and SBR the gun.
I like your "be careful" comment PB82 having already experienced lite smiles in the M.T. on what is an acceptable load of LongShot in my pistols. Looking back through my notes I tried the 220 Xtremes with 8.0gr LongShot producing 1151fps in a 6" barrel with the CCI 300 primer, 1.253 OAL. This was a max load in my KKM barrel as 8.2gr produced one lite smile in the 5 rounds tested. Good accuracy at 2" - 25yds for 5 shots.
I will try the mag primer and work up to 8.0gr in the M.T. to see how it goes. I can always shoot them in the pistol at this level if they are too hot for my barrel. If the slower powders are a problem in this rifle, I am wondering if the CFE Pistol powder I have might be even safer to get to max loads for the 200 & 220gr bullets I prefer?