Re: Mossberg 4x4 25-06
Hi Corey006, hope you are still following this thread, if not, I will PM you later.
I have had a look at the bolt on the client's rifle and can see the cross pin. The pin in this instance is approximately .250" diameter, very hefty. The set up is very much identical to the 1960's Omark target rifles from Australia (except the Omark had 3 lugs identical to the Sako TRG). I am sure others have used this pin design over the years (Ross rifle company LOL).
The lugs and bolt face are one piece of steel, the bolt body another piece of steel, the pin holds it all together. The bolt head slides inside the bolt body.
Unlike the Omark, there is a great deal of slop in the Mossberg bolt head. Furthermore, the pin is tightly fitted through the bolt head but is loosely fitted in the outer body. It is however, the type of part that can be inspected easily. Nevertheless, there are some very thoughtless people around and I have seen an highly qualified engineer try to force a bolt home when the cocking piece (M700) was rotated by accident and became misalingned prior to reassembly of the bolt into the action- hope I explained that clearly. The design lacks the kind of fool proofing that used to be built in to the military bolt actions.
The client who owns this particular rifle is worrysome in this regard (I don't want to bag him but when it comes to safety issues, I guess it pays to air such things). He is an older man (I do find that some of my older clients have the most inflexible attitudes and inability to learn) and his reloading techiniques are frightening. He was loading 62 grains of H4831sc behind the 150 grain bullet for a muzzle velocity of 3030fps- this is a .270 Winchester!. The primer pockets of his brass had swollen some time ago and thinking it was a bad batch of brass (?) he has been gluing the primers in ever since. To make matters worse, the COAL was so long that the projectiles were thoroughly jammed into the rifling upon chambering each round. It has taken a long time to convince the client to let me sort out his loads etc, very stubborn. I know that careless use of firearms happens a lot all over the world but its a surprise to see it for myself.
This whole thing has me perplexed, on the one hand, the rifle I have on my bench has to some extent, been proof tested (so to speak). You could even call it idiot proof. On the other hand, long term harsh abuse can lead to weaknesses that were not present before. The lugs are in very good condition and to be fair, the rifle achieves 2980fps with mild pressure, no case head/ primer pocket expansion.
OK, that was pretty long winded, what I wanted to ask was, where did the pics of the pressed bolt thjat fell apart come from, is there a story/ explanation to go with the pics.
Last edited by Kiwi Nate; 02-03-2010 at 01:01 AM.