Maybe the pump tube heats up a bit when you pump, and the delay lets it cool back down?? (Aluminum heats and cools quickly)Cooler air is denser, so cooler air=more air pumped into the chamber.Just kinda thinkin' with my keyboard..........
This gun is fresh from CMP a few days ago and shooting H&N Field Target Trophy 8.64 gr at 377fps and very accurate.I need the right pellet for this gun because I think it can do even better. WHAT SHOULD I BUY?
One of mine shoots JSB 8.44 gr best.
Each gun is different.- Some/many will shoot "almost anything" you feed it, well.- - Example I shot inexpensive Daisy and Crosman pellets and they shoot almost as good as my match pellets. I only say "almost" because I did not have a 10x scope on the rifle to really test the pellets. But they hit where I aim.- Others will be picky.- - They may shoot one pellet well, and another poorly.- - What my gun shoot well, your gun may shoot poorly.The only way to KNOW, is to test the pellets yourself in your gun.- Put a scope of about 9x on the rifle, so that you can accurately aim at a target. This is to eliminate aiming error as a cause of a large group size.- Set up a stable rest, so that the rifle is really stable, and does not move when you shoot. - Hold and fire the gun the SAME for each shot.
Quote from: ac12 on February 28, 2021, 02:13:53 PMEach gun is different.- Some/many will shoot "almost anything" you feed it, well.- - Example I shot inexpensive Daisy and Crosman pellets and they shoot almost as good as my match pellets. I only say "almost" because I did not have a 10x scope on the rifle to really test the pellets. But they hit where I aim.- Others will be picky.- - They may shoot one pellet well, and another poorly.- - What my gun shoot well, your gun may shoot poorly.The only way to KNOW, is to test the pellets yourself in your gun.- Put a scope of about 9x on the rifle, so that you can accurately aim at a target. This is to eliminate aiming error as a cause of a large group size.- Set up a stable rest, so that the rifle is really stable, and does not move when you shoot. - Hold and fire the gun the SAME for each shot.Sage advice! I agree 100%.
Quote from: ac12 on February 28, 2021, 02:13:53 PMEach gun is different.- Some/many will shoot "almost anything" you feed it, well.- - Example I shot inexpensive Daisy and Crosman pellets and they shoot almost as good as my match pellets. I only say "almost" because I did not have a 10x scope on the rifle to really test the pellets. But they hit where I aim.- Others will be picky.- - They may shoot one pellet well, and another poorly.- - What my gun shoot well, your gun may shoot poorly.The only way to KNOW, is to test the pellets yourself in your gun.- Put a scope of about 9x on the rifle, so that you can accurately aim at a target. This is to eliminate aiming error as a cause of a large group size.- Set up a stable rest, so that the rifle is really stable, and does not move when you shoot. - Hold and fire the gun the SAME for each shot.ac12,i purchased a pistol vise a few years ago and use it to test different pellets in my air pistol. the pistol vise will hold the pistol tightly, and i secure the vise to a table top with clamps. since there is no recoil to speak of, nothing moves - even when re-loading. i use this set-up the same as you would use a Ransom Rest.i then aim the entire rig at the first bull and shoot (5) pellets without moving anything to see how they group. i then move the rig to the next bull for the next pellet to test and fire (5) of those pellets to see how they group. i usually do this 2-3 times for each pellet. i like using the 10M air rifle targets as they have (12) bulls on them. makes for an interesting and informative afternoon.
How often to you oil the wiper and o-rings on the pump rod?
Quote from: JohnnyPDX on February 28, 2021, 10:48:26 AMThis gun is fresh from CMP a few days ago and shooting H&N Field Target Trophy 8.64 gr at 377fps and very accurate.I need the right pellet for this gun because I think it can do even better. WHAT SHOULD I BUY?Merlin Match Plus from CMP. wadcutters, less than $8 per tin of 500 . . . or, 73.50 for a full sleeve of 10 tins (5000 pellets)don't know what shipping is, but you will have a hard time finding a better pellet
Hi Johnny,Have you checked the foam piston seal oiler? It should be noticeably wet with oil. If you added enough oil to make it visibly wet, you may find the velocity increases significantly. See PA blog post links below.I think that your used 853 may also be shooting a bit slow due to wear at the linkage pivots. A lot of that can be regained by increasing the compression; by taking up compression volume. However, the peak pumping force will increase, possibly to the point that you might not like it.My unmodified Avanti 753 shoots H&N 7.3 grain wadcutters at 500 FPS. The pumping is harder than I would like. More exactly, I don't like the way the pump lever slams shut when the hinges go over center. As far as I know, the 853 and 753 are mechanically similar.Pyramyd Air article about 853 velocity increase after oiling:https://www.pyramydair.com/blog/2016/05/the-daisy-853-part-1/https://www.pyramydair.com/blog/2016/05/the-daisy-853-part-2/https://www.pyramydair.com/blog/2016/05/the-daisy-853-part-3/
It's shooting JSB 8.4 at 420fps, that's enough to CONSISTENTLY make ONE TIDY HOLE at 10+ meters. It's so consistent I won't mess with oiling until it's not consistent.The cocking effort is a comfortable and I won't change it.