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7mm velocities in F-Class

This thread is a question for those who shoot 600-1000 yd. F-Class with any variant of 7mm.

Obviously, this will probably have to come from e-targets. Some people however chrono loads at this distance.

I shoot a 6mm Dasher. The load is 33.7 gr. of H4350 Extreme. MV is 2820. 1K velocity is 1560. I had noted the guy next to me shooting a 7mm-06 using 180’s (Berger VLDs?) had a 1K velocity of 1660.

I understand I could look this up, but that is just a general answer. Some of you have custom chambers and throats and get better than book velocities. Looking for your MV’s.

Also looking for anything you do to help mitigate or control recoil.
recoil ? I think stock style has a little to do with that ?
I have four Urban Rifleman's $400 dollar Bench Rest Stocks.
From my Dashers to my .284's I find no recoil problem ?
I am a lite weight Guy the wind moves me.
 
recoil ? I think stock style has a little to do with that ?
I have four Urban Rifleman's $400 dollar Bench Rest Stocks.
From my Dashers to my .284's I find no recoil problem ?
I am a lite weight Guy the wind moves me.
I sometimes think that is the key. light weight fellows sometimes handle recoil easier than big guys it seems. Maybe because it's easier to move with the gun so you get less felt recoil.
 
There’s good reasons why the 284 and variants are so popular
Excellent ballistics vs recoil.
If your trying to run fast in a condition not getting pushed around by recoil is really helpful
 
I’m curious what 6mm bullet are you shooting? Your MV is slow but your 1K speed is quite reasonable for a Dasher. I shoot 109 Berger’s at 2985 and at 1K my speeds are about the same. 300’ asl.
That particular day was 110 SMK's. As noted the BC's are great, but not up to 7mm 180/184's. The MV was chronographed.
The TV's (terminal velocities) were given by the ET's, and to most of the competitors that day, seemed in line with computer graphics. Not saying all were dead on, just 'reasonable' in comparison to what they should get.
 
I’m curious what 6mm bullet are you shooting? Your MV is slow but your 1K speed is quite reasonable for a Dasher. I shoot 109 Berger’s at 2985 and at 1K my speeds are about the same. 300’ asl.
DTAC and Berger 115's produced roughly the same results. In this case I was doing better with accuracy with the DTACs and later Bergers. But, I think that has to do with my throat length. The 110's are barely in the case to reach the lands. So, I have to seat them off the lands. DTACs and Bergers were each seated .005" into the lands.
 
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DTAC and Berger 115's produced roughly the same results. In this case I was doing better with accuracy with the DTACs and later Bergers. But, I think that has to do with my throat length. The 110's are barely in the case to reach the lands. So, I have to seat them off the lands. DTACs and Bergers were each seated .005" into the lands.
I shot 110's for a while at .010" off and they shot really well. Then I changed lots and the new lot wouldn't shoot. I went to 109's and the've been great lot to lot. The 109 needs more free bore so you might give them a try if you can find some.
 
I have been told by some of the F-open guys that heat management is another concern. Magnums, both 7 and 30 will roast a barrel if you get on a condition with a fast puller. Dumping 20 plus sighters in under 7 minutes (possibly less, much less, when it’s someone who rails it)

I haven’t experienced it personally but I’ve been told it can open your gun up at 1000 At the end of a string.
 
complete thoughts…. yea


…20 shots, plus sighters.


though last SWN I pulled for an open shooter who took 37 shots in his first match of the day.
 
DTAC and Berger 115's produced roughly the same results. In this case I was doing better with accuracy with the DTACs and later Bergers. But, I think that has to do with my throat length. The 110's are barely in the case to reach the lands. So, I have to seat them off the lands. DTACs and Bergers were each seated .005" into the lands.

Guys, side question, it’s safe to say DTAC’s are discontinued at this point, right? I have seen that term on a vendor site or two, and have not seen any in stock for quite some time, even where catalogued, including David T’s site. I only ever saw maybe four or five venders, to begin with.

Are those 110 SMK’s in stock anywhere?
 
I shot 110's for a while at .010" off and they shot really well. Then I changed lots and the new lot wouldn't shoot. I went to 109's and the've been great lot to lot. The 109 needs more free bore so you might give them a try if you can find some.
Unfortunately, I passed on a couple of really good deals on the 109's. I was seeing the longer bullets just barely reaching the lands and thought why waste the money. I need to go back and find where bullets shoot best at seating depths off the lands.
 
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Guys, side question, it’s safe to say DTAC’s are discontinued at this point, right? I have seen that term on a vendor site or two, and have not seen any in stock for quite some time, even where catalogued, including David T’s site. I only ever saw maybe four or five venders, to begin with.

Are those 110 SMK’s in stock anywhere?
Off the market for now. Sierra, who makes the DTAC's for Tubb, is up to their eyeballs in other orders, along with not always being able to field a full working force.

As to the 110's, I've seen them come and go, but never stay in stock anywhere. Looking often is the only way to find them.
 
I’m curious what 6mm bullet are you shooting? Your MV is slow but your 1K speed is quite reasonable for a Dasher. I shoot 109 Berger’s at 2985 and at 1K my speeds are about the same. 300’ asl.
Sorry, a lot of days late on this. I use 115 Dtacs and Bergers VLD's. Edit: I see that I had posted it above.
 
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complete thoughts…. yea


…20 shots, plus sighters.


though last SWN I pulled for an open shooter who took 37 shots in his first match of the day.
Could be that they shot two rifles to foul them both as they were not sure which one they were going to use.

As for 7mm velocity my wife’s PRCW runs from 2885-2940. I decided to keep it in the lower node of 2890 to keep from getting clockers for her.
 

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