6GT project/range report

[shoot4fun]

What bullet?

I have been shooting some 103VT but until I decided until I get the barrel broken in and brass fire formed I'll shoot "cheap" bullets.

 

[ballisticdaddy]

Yesterday I decided to start working with the new 6GT barrel installed on a BAT B RBLPRE in a LRB stock.
I opened the Lapua brass, did the usual steps in prep for powder and bullet but I will say priming the brass was anything but usual. The primer pockets were so tight I didn't think I was going to be able to get primers in. I started with CCI450 but that was a complete no-go. Thinking the Federal 205 would be easier, I tried one of them. NOPE! Since these were simply going to be for barrel break-in I finally wound up priming 25 on the priming setup for my Co-Ax press (which has plenty of leverage but can be a PITA).
I noticed in doing that the rims are apparently not 100% uniform because a few of the 25 either didn't want to fit in the "shell holder". Some oversize and some under.
Has anyone else noticed issues with Lapua 6GT brass primer pockets and rims?

I am on my second 6GT barrel and agree that the primer pockets are tight but I have shot thousands of CCI 450 primers in Alpha brass. For the record I did seat them on my Dillon 550 for the leverage.

 

[shoot4fun]

I am on my second 6GT barrel and agree that the primer pockets are tight but I have shot thousands of CCI 450 primers in Alpha brass. For the record I did seat them on my Dillon 550 for the leverage.

I am using Alpha on my precision repeater barrel. Pockets are tight but not nearly as much as on the Lapua brass.

 

[Jet]

CCI450, BR4 and 205M primers seated just fine for me in new Lapua brass

 

[karrarararararar]

Managed to get a load I like with the 110 smk. 35.0gr of Shooters World precision, Alpha brass, cci 41. Planning to shoot this rifle in the Arizona State Highpower match next month.

 

[Tangent]

Managed to get a load I like with the 110 smk. 35.0gr of Shooters World precision, Alpha brass, cci 41. Planning to shoot this rifle in the Arizona State Highpower match next month.

Excellent results. I think my decision to go with 6GT was the right one. Can't wait to try it out once I've raised the funds to get the rebarrel done. Initially planning to use the 107 SMK but I'd like to try out the 110 too. I presume I'll have to go for 1 in 7 twist though?

 

[karrarararararar]

Excellent results. I think my decision to go with 6GT was the right one. Can't wait to try it out once I've treated the fund to get the rebarrel done. Initially planning to use the 107 SMK but is like to try out the 110 too. I presume I'll have to go for 1 in 7 twist though?

I have a 1:7.5, but I don't think a 1:7 would hurt.

 

[shoot4fun]

CCI450, BR4 and 205M primers seated just fine for me in new Lapua brass

This box of Lapua 6GT was in the first shipment. Maybe they caught it and made a correction?

 

[Liven The Dream]

Managed to get a load I like with the 110 smk. 35.0gr of Shooters World precision, Alpha brass, cci 41. Planning to shoot this rifle in the Arizona State Highpower match next month.

Like this info.
Just ran my New GT yesterday. 30" 1-7.5 Alpha 450's 109 HB. Varget 32.5 gr. about your finding 2897-2903
Going to run one more test of .020 and .015 off the lands.
Like others have said " like my idea to go 6GT", gave up one Dasher.

 

[swd]

Excellent results. I think my decision to go with 6GT was the right one. Can't wait to try it out once I've treated the fund to get the rebarrel done. Initially planning to use the 107 SMK but is like to try out the 110 too. I presume I'll have to go for 1 in 7 twist though?

7.5” works fine with the 110SMK.

 

[Clancy]

I’ve been sitting on mine waiting on deer season to end. I have Lapua brass and did prime a couple last night without any trouble. Fed 205.

I’ll be using 109s and N150 to start off.

 

[Fire Dog]

Has anyone considered a 40 degree version and thus you have a GT-40?

 

[Tangent]

7.5” works fine with the 110SMK.

That's good to know, even at sea level and in the colder weather?

 

[Rob01]

That's good to know, even at sea level and in the colder weather?

Yes will be fine. Hornady lists the minimum twist at 7.7 so 7.5 is fine.

 

[Liven The Dream]

That's good to know, even at sea level and in the colder weather?

I ran my 1-7.5 Dashers with 109's and did very well at 1000 F/Class Target. In 50 to 87 degree temps Dry Air.

 

[swd]

That's good to know, even at sea level and in the colder weather?

Yes, 300’ ASL in 40-50F and I was shooting them slow at 2800 even in a BRA. It was an absolute hammer! Krieger 7.5”.

 

[Tangent]

Yes will be fine. Hornady lists the minimum twist at 7.7 so 7.5 is fine.

Sierra say a 1:7 is required for the 110 SMK.

 

[Rob01]

Sierra say a 1:7 is required for the 110 SMK.

My bad. I saw 110 and my mind thought ATip.

 

[karrarararararar]

Shot the 110's at 1k today. Pretty happy with the results. I built this rifle to shoot xtc and it is definitely going to eat some x's at 600. I shot my 1st string (198) without my silencer then put it on for and made some stock tweaks to get more comfortable for the 2nd (199)

 

[Liven The Dream]

Gave the 6 GT a run at 600 today 109 Bugger
Only had 20 around !
200-8