Sierra 69 gr HPBT-MATCH and RL-10x

colospgsAVID · February 16, 2010, 11:07 PM

Hi all,
Is RL-10x too fast for a 69 grain projectile in a 1 in 9 twist barrel? I have a Mini-14 TARGET and would like to load with RL-10x. I can't find data for a bullet this heavy. The bottle of RL-10x states good for light bullets in .223. So is this like under 55 grains? I think a heavy .223 would be like 77+? Maybe needing a 1 in 7 barrel. My manual that lists this very bullet (lyman) shows anything but RL-10x. They do show others but as hard as it is not to look at the burn rate... I'd rather not do that. Components are: New Winchester brass trimmed to 1.750", Rem 6 1/2 primer, Sierra .224 69 grain HPBT-MATCH bullet. Will 10x work? any experience?

**Unclenick** · February 16, 2010, 11:17 PM

Yeah, RL 10X was specifically designed for light bullets. Your maximum loads with it under heavier bullets won't get them to maximum velocity. The 69's will work better with stick powders like Varget or IMR or H 4895, or with sphericals like Winchester 748 or AA2520. If you have to use the 10X, figure you'll max out somewhere around 20 grains.

SKULLANDCROSSBONES65 · February 17, 2010, 05:58 AM

G'day, this is from SIERRA.

223 Remington (AR-15)
Primer: Remington 7 1/2 Test Firearm: Colt AR-15A2 HBAR
Case: Federal BBL Length: 20"
Twist: 1x7" Trim-to Length: 1.750"
Bullets:
#1380 .22 Caliber (.224) High Velocity 69 gr. HPBT Match OAL 2.260

Powder/Velocity 2500... 2600... 2700... 2750... 2800... 2850... 2900
Viht N133......... 21.1... 21.8.... 22.5
IMR-4198......... 18.8... 19.4.... 20.0... 20.3
X-Terminator.............. 21.9... 22.6.... 22.9... 23.3
AA-2230.......... 21.9... 22.7.... 23.5
748................. 23.7... 24.4.... 25.1... 25.5..... 25.8
AA-2460.................... 22.9... 23.7.... 24.1.... 24.5
H335............... 21.2... 22.5.... 23.8
TAC................. 22.1... 22.8.... 23.5.... 23.8.... 24.2
IMR-4895......... 22.9... 23.7.... 24.5
Viht N135......... 21.7... 22.5
VARGET........... 23.3.... 24.1... 24.9.... 25.3..... 25.7.... 26.1
IMR-4064......... 23.3.... 24.1
AA-2520......................23.1.... 23.8... 24.3.... 24.7..... 25.1...... 25.5
IMR-4320......... 24.0.... 24.7... 25.4
Viht N140......... 23.1.... 23.9... 24.7.... 25.1
RE-15.............. 23.3.... 24.1... 24.9.... 25.3.... 25.7
Energy/ft.lbs..... 957.... 1035... 1117... 1158... 1201..... 1244.... 1288
Accuracy Load: Varget/ 25.3grs. 2750fps/ 1158ft. lbs.

(I hope I got these in the right order)

February 16, 2010, 11:17 PM	#2
Unclenick Staff Join Date: March 4, 2005 Location: Ohio Posts: 21,060	Yeah, RL 10X was specifically designed for light bullets. Your maximum loads with it under heavier bullets won't get them to maximum velocity. The 69's will work better with stick powders like Varget or IMR or H 4895, or with sphericals like Winchester 748 or AA2520. If you have to use the 10X, figure you'll max out somewhere around 20 grains. __________________ Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle

February 17, 2010, 05:58 AM	#3
SKULLANDCROSSBONES65 Senior Member Join Date: August 19, 2008 Location: Far Nth Wst QLD Australia Posts: 992	G'day, this is from SIERRA. 223 Remington (AR-15) Primer: Remington 7 1/2 Test Firearm: Colt AR-15A2 HBAR Case: Federal BBL Length: 20" Twist: 1x7" Trim-to Length: 1.750" Bullets: #1380 .22 Caliber (.224) High Velocity 69 gr. HPBT Match OAL 2.260 Powder/Velocity 2500... 2600... 2700... 2750... 2800... 2850... 2900 Viht N133......... 21.1... 21.8.... 22.5 IMR-4198......... 18.8... 19.4.... 20.0... 20.3 X-Terminator.............. 21.9... 22.6.... 22.9... 23.3 AA-2230.......... 21.9... 22.7.... 23.5 748................. 23.7... 24.4.... 25.1... 25.5..... 25.8 AA-2460.................... 22.9... 23.7.... 24.1.... 24.5 H335............... 21.2... 22.5.... 23.8 TAC................. 22.1... 22.8.... 23.5.... 23.8.... 24.2 IMR-4895......... 22.9... 23.7.... 24.5 Viht N135......... 21.7... 22.5 VARGET........... 23.3.... 24.1... 24.9.... 25.3..... 25.7.... 26.1 IMR-4064......... 23.3.... 24.1 AA-2520......................23.1.... 23.8... 24.3.... 24.7..... 25.1...... 25.5 IMR-4320......... 24.0.... 24.7... 25.4 Viht N140......... 23.1.... 23.9... 24.7.... 25.1 RE-15.............. 23.3.... 24.1... 24.9.... 25.3.... 25.7 Energy/ft.lbs..... 957.... 1035... 1117... 1158... 1201..... 1244.... 1288 Accuracy Load: Varget/ 25.3grs. 2750fps/ 1158ft. lbs. (I hope I got these in the right order) __________________ If you're not confused, you're not trying hard enough! When you're confused, I'll try to use smaller words!!!

February 16, 2010, 11:07 PM	#1
colospgsAVID Senior Member Join Date: January 2, 2010 Location: Colorado Springs Posts: 188	Sierra 69 gr HPBT-MATCH and RL-10x Hi all, Is RL-10x too fast for a 69 grain projectile in a 1 in 9 twist barrel? I have a Mini-14 TARGET and would like to load with RL-10x. I can't find data for a bullet this heavy. The bottle of RL-10x states good for light bullets in .223. So is this like under 55 grains? I think a heavy .223 would be like 77+? Maybe needing a 1 in 7 barrel. My manual that lists this very bullet (lyman) shows anything but RL-10x. They do show others but as hard as it is not to look at the burn rate... I'd rather not do that. Components are: New Winchester brass trimmed to 1.750", Rem 6 1/2 primer, Sierra .224 69 grain HPBT-MATCH bullet. Will 10x work? any experience?