195 Bergers, Rl 33, 7 RUM

[jett]

Here is what I got yesterday with a 7 RUM by Dan Glover of Dan's Custom Guns, 30 inch Brux, 1/8 twist, .005 off the lands, CCI 250s, Nosler brass, Reloader 33, magneto speed, 195 Bergers, one ragged hole at 100 yards as I tested the last 4 powder charges during barrel break in.

89 gr - 3075
90 gr - 3037
91 gr - 3107
92 gr - 3101
92.5 gr - 3128
93 gr - 3166 may have seen very slight ejector blemish, no heavy bolt lift
93.5 gr - 3162 no pressure signs
94 gr - 3172 no pressure signs
94.5 gr - 3196 no pressure signs

The 4 shots from 93 - 94.5 gr created a one hole group at 100 yards with a shoot and clean break in routine. These were the first 9 shots fired in this gun. Dan sure turns out some mighty fine rifles. Your gun may pressure up differently so please start low and work up.

I am interested in hearing what others are getting with this combination of Rl 33, 195 Bergers and 7 RUM.

 

[Doublezranch]

My 14 year old son shoots a 7 Rum sendero. He loads 190 matrix, 102.5 grains of 33 with a velocity of high 3200. Extremely accurate groups from 200 out. In fact, he just filled his youth buck tag with his mother (I had to work) with his 7 rum. My wife said the bullet was so fast and hit with such force that she felt sad for the deer!! I'm sure excited to hear the Berger is working out. They make great bullets.

 

[jett]

Thanks ZZ. Can you describe what kind of pressure signs this powder exhibited in your son's gun?

 

[etisll40]

following thread

 

[Lrt307]

You may wanna load that thing up and let it breath a little. I was running 95 grains of rl33 in 7 rum on load development with no psi signs 26 inch tube 2962 fps. I will load mine up and see what happens.

 

[Doublezranch]

There is no pressure signs. Not even the perverbial ejector mark on the headstamp. That baby shoots fast, straight and hits incredibly hard. It was truly amazing watching a very decent antelope buck get taken completely off his feet when that bullet hit him. I told Zayne to break him down so there was no tracking....he did just that.

 

[duckhunter175]

Is your rifle a short chambered 7RUM or a SAAMI??

I'm working on a 7RUM build and heard that loading out to lands or few thou off negates the purpose of the .400 freebore it was designed with??

Here is what I got yesterday with a 7 RUM by Dan Glover of Dan's Custom Guns, 30 inch Brux, 1/8 twist, .005 off the lands, CCI 250s, Nosler brass, Reloader 33, magneto speed, 195 Bergers, one ragged hole at 100 yards as I tested the last 4 powder charges during barrel break in.

89 gr - 3075
90 gr - 3037
91 gr - 3107
92 gr - 3101
92.5 gr - 3128
93 gr - 3166 may have seen very slight ejector blemish, no heavy bolt lift
93.5 gr - 3162 no pressure signs
94 gr - 3172 no pressure signs
94.5 gr - 3196 no pressure signs

The 4 shots from 93 - 94.5 gr created a one hole group at 100 yards with a shoot and clean break in routine. These were the first 9 shots fired in this gun. Dan sure turns out some mighty fine rifles. Your gun may pressure up differently so please start low and work up.

I am interested in hearing what others are getting with this combination of Rl 33, 195 Bergers and 7 RUM.

 

[Cutarm]

Is your rifle a short chambered 7RUM or a SAAMI??

I'm working on a 7RUM build and heard that loading out to lands or few thou off negates the purpose of the .400 freebore it was designed with??

I just went though that process. Short throat resulted in a wide spread of velocities and no pattern doing a ladder test.

Ended up throating to SAAMI spec .400". That fixed it.

That's with a Krieger finished to 27", Retumbo, & Berger 7mm 195's.

 

[duckhunter175]

What COAL are you loading to and what velocity are you getting? I'd be interested in getting a start point for development.

 

[Cutarm]

What COAL are you loading to and what velocity are you getting? I'd be interested in getting a start point for development.

I seated the Berger 7mm 195gr at the shoulder/neck junction plus another .040" into the case to duplicate my short throat rounds.

86.0gr Retumbo
3078fps
3069fps
3061fps

Grouped under a MOA right off the hop. I don't think I'll go any higher than 86.0gr of Retumbo. Anymore and I start losing primer pockets on new Remington brass.