Subsonic load & gas tube question

[Mousehouse]

I need several loaded using 200 & 220 grain bthp to try out in two different 300 whisper/fireball AR's. I have one from model 1 sales and one from J&T distributing.

What powder should I use and how much?

They will be shot with a suppressor and without.

Where is a good place to get adjustable gas tubes or what is recommended if the gun won't function properly with subsonic ammo?

[Artful]

I need several loaded using 200 & 220 grain bthp to try out in two different 300 whisper/fireball AR's. I have one from model 1 sales and one from J&T distributing.

What powder should I use and how much?

They will be shot with a suppressor and without.

Where is a good place to get adjustable gas tubes or what is recommended if the gun won't function properly with subsonic ammo?

for the Adjustable Gas Tubes

http://www.brownells.com/aspx/NS/store/ProductDetail.aspx?p=9947&title=AR-15%2fM16+REGULATED+GAS+TUBE

Adjust Gas Flow For Heavy Or Light Loads
Lets you adjust bolt speed to match individual loads. Dial down to slow bolt speed for softer recoil impulse or close completely for single shot operation. Reduces wear and battering of recoil system. Helps control secondary recoil movement so rifle stays on target for quicker follow-up shots.

SPECS: Stainless steel. Requires no modification to rifle.
Catalog page 22

741-000-001 Rifle Gas Tube $59.95

741-000-002 Carbine Gas Tube $59.95


Gas blocks http://jtdistributing.com/store/gas_blocks.html

[Mousehouse]

Thanks for the info. The only bad thing is they are out of the carbine gas tubes right now. I will try back in a week or two.

Where is a good place to get 220 grain 30 caliber bthp bullets at a good price? Midway USA has them for around $30 per 100.

Has anyone used IMR 4895 powder in their 300 whisper loads? Just wondered. That is the powder I use in 90% of my rifle loads and would be nice since I have a lot of it.

[Artful]

http://www.wideners.com

if you don't need 220 grainers I find the mil. surplus to be a good buy

Y30150M1 NEW YUGOSLAVIAN M1 BULLET
NEW MFG. 30 CAL 150GR M1 MIL-SPEC BULLET.
BRAND NEW NOT PULLED. FLAT BASE W / ROUNDED HEEL.
CANNELURE IS FOR 30-06.
CAN BE LOADED FOR 308 IF YOU SEAT CANNELURE
BELOW CASE MOUTH FOR CORRECT OAL.
COPPER JACKETED! / NO STEEL
$20.00 PER 250 / $72.00 PER 1000

or

UF30M80 UNFIRED 30cal FMJBT W/C M80 147GR $65.00 PER 1000
UNFIRED 30cal M80 Projectile
STEEL JACKET, COPPER PLATED FMJBT. W/CANNELURE
For 308 or 30-06
May have a few Match and older M80 projectiles mixed.
No guarantee on mixture we will weigh a little heavy to compensate.
These are CHEAP PULL DOWN PROJECTILES.
1=1000
Manufacturer: Surplus Military
Stock Number: UF30M80
Number In Stock: 90
Price: $65.00 each