Gamo Compact vs IZH 46 – Part 4
by B.B. Pelletier
Before I begin with today’s report, there’s some things I need to cover. The first has to do with leaving comments. Some of you think you have to leave a comment on the report to which your comment pertains. You don’t have to do that. Leave your comment on the current blog, if you like. This will help you find my answer rather than having to remember which post had your question.
Second, and this is related, some of the older posts now have over 200 comments. When the comments go over 200, Blogger (the software we are using) displays only the first 200 comments unless you direct it to do otherwise. So, people will leave a comment, then they will look for it and it doesn’t appear in their window. When a post has over 200 comments, select “Newest” comments (a blue selection tab at the top right of the comments window) after you click on “Leave a Comment.” Then, you’ll see your comment.
Let’s look at the power of an 11-year-old IZH 46. I told you in Part 2 that this model produces velocity in the 410 to 430 f.p.s. range. That’s with a lightweight wadcutter lead pellet – no trick or synthetic pellets. My particular pistol always produced about 430 f.p.s. with RWS Hobbys, so today we’ll find out what 11 years and 8,000 shots has done to this single-stroke mechanism. You’ll recall that I told you these mechanisms have to be warmed up before they perform at their specified velocity, and we saw that with the Gamo Compact in Part 3.
RWS Hobby pellets averaged 444 f.p.s.! That’s with a spread from 433 to 457. I’m as surprised as anyone about that, but I think I’ve discovered a way to pump new life into old single-strokes. When I started this test series, the gun began with a shot at 303 f.p.s. and within 10 shots it was up to about 390. After 20 more shots, it seemed to stall out around 400 f.p.s. Then, I tried something new. Instead of one fast pump stroke that I normally give the gun, I pumped two semi-strokes real fast and then closed on the third stroke. The first two semi-strokes were only about 25 percent of the pump stoke distance. I did all three pump strokes in rapid succession.
What I think this does is limber up the pump head so the third stroke really gathers all the air it can. Whatever the cause, the numbers don’t lie. My pistol now shoots faster than ever before. Next time I test the Gamo Compact, I’ll retest the velocity using this new procedure.
Crosman Supermatch averaged 415 f.p.s., again, using the new pumping procedure. The spread is 409 to 421. With the old style of one fast stroke, the average falls to 390.
Gamo Match pellets averaged 438 using the new pump method. The spread was 433 to 448. With the old, fast single stroke, the average was 406 f.p.s.
H&N Match averaged 447 f.p.s. The spread was from 441 to 452, and I discovered something additional about this new method. It isn’t how fast you pump, but rather how far the two false pumps go. If they go as far as three-quarters of the full stroke, the power increased by 10-15 f.p.s. So, naturally I had to retest Hobbys.
RWS Hobby retest
This time, the average was 471 f.p.s., with a spread from 466 to 476. That means my 11-year-old IZH 46 is now shooting very close to where a 46M is supposed to shoot. My gun was always a fast one, but this goes well beyond that.
I feel like I own an 11-year-old thoroughbred horse that should be out to stud and instead he’s posting the fastest times of his career. I think I’ve stumbled on to something that’s very fundamental and very wonderful. I want you all to try this new method and see what it does for your guns. Don’t forget to lubricate them before you do it.
How to oil an IZH 46
Someone asked how to properly oil an IZH 46, so I took a picture. The pump handle is fully extended, bringing the pump head out to the bottom of the pump slot, so it is barely visible. It’s no different than any other pneumatic that has the pump built in, but here’s the picture anyway. I use three drops per session, and I lube my old gun very frequently. If I were shooting it every day, I’d lube it once a week. You cannot over-lubricate your gun by doing this, so no worries.
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